Dissolution Characteristics of Selenium in Selenium-Enriched Tea Leaves
The leachable characteristics of selenium in selenium-enriched tea leaves were investigated by pure water immersion method,and the dissolution characteristics of Se in selenium-enriched teas(large-leafed green tea,large-leafed yellow tea and small-leafed green tea)were investigated by electrothermal plate ablation-ICP-MS with different immersion temperatures and immersion times,with a view to providing a basis for the nutritional value of selenium-enriched teas for human beings.The results showed that the dissolution rates of Se in large-leaf green tea,large-leaf yellow tea and small-leaf green tea were 13.26%,17.90%and 17.10%,respectively,and the dissolution rates were low,which seriously restricted the efficiency of selenium transfer from tea products to the human body;the dissolution rate of Se in selenium-enriched tea increased gradually with the increase of the time of dissolution and the elevation of the infusion temperature,and the rate of dissolution in the range of 0-30 min increased continuously with the growth of time,and the fastest rate of rise was in the range of 0-30 min and the rate of increase was in the range of 0-30 min and the rate of dissolution in the range of 0-30 min.continued to rise,the fastest rate of increase in the stage of 0-5 min,followed by a gradual slowdown,when the extraction time of more than 60min,the leaching is close to the equilibrium state;for the large-leafed species of tea,the dissolution temperature is more significant in comparison with the effect of the dissolution time,and the small-leafed species of tea is the opposite of it;when the steeping temperature is higher than 25℃,within 120 min,the dissolution rate of selenium in selenium-enriched small-leafed species of tea leaves with the dissolution time showed a increased logarithmically,and the correlation and fit were better than that of the large-leafed tea leaves.
NETL
NSTL
万方数据
